Abraham Vargas, 27, is believed driving an Orange Nissan Quest, license number 7CIN189. The car has tinted windows, with damage on the driver's said Los Angeles police Officer Norma Eisenman.
The child's mother -- Vargas's former girlfriend -- had obtained a restraining order against him, Eisenman said.
The crime occurred about 6:30 a.m. in the 1000 block of Lorena Street, Eisenman said.
Vargas is Hispanic and weighs about 180 pounds. He was wearing a red sweatshirt and blue jeans. His son, identified as Edwin Vargas, is Hispanic, and was wearing a red sweatshirt and blue sweat pants.
Anyone seeing them was urged to call 911, Eisenman said.
To celebrate the 15th birthday of its Chandra X-ray Observatory, NASA has published four previously unreleased images of supernova remnants.
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